some text searches give no results?

I think we have encountered this problem before, but here I noticed it specific to one manuscript. Searching Salzinnes for "Re":fine

"Rex": not fine

"RExi": actually fine again!

Riesencodex handles Rex ok:

Einsie doesn't like Rex either though:

No file or test is named. Start by reproducing the searches described for Salzinnes, Riesencodex, and Einsie, comparing “Re”, “Rex”, and “RExi” and the attached results. Trace the search entry point to identify where the inconsistent manuscript behavior is handled; done means the affected searches return the expected results consistently.

Written by the indexing model from the issue text.